upgrade eslint to v9

eslint.config.mjs

@@ -0,0 +1,123 @@
+import cypress from 'eslint-plugin-cypress';
+import reactHooks from 'eslint-plugin-react-hooks';
+import { fixupPluginRules } from '@eslint/compat';
+import globals from 'globals';
+import babelParser from '@babel/eslint-parser';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import js from '@eslint/js';
+import { FlatCompat } from '@eslint/eslintrc';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all,
+});
+
+export default [
+  {
+    ignores: [
+      '**/dist/',
+      '**/examples/',
+      'src/content/loaders/_*.mdx',
+      'src/content/plugins/_*.mdx',
+      '.github/**/*.md',
+      '**/README.md',
+    ],
+  },
+  ...compat.extends(
+    'eslint:recommended',
+    'plugin:react/recommended',
+    'prettier'
+  ),
+  {
+    plugins: {
+      cypress,
+      'react-hooks': fixupPluginRules(reactHooks),
+    },
+
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+        ...globals.jest,
+        ...cypress.environments.globals.globals,
+      },
+
+      parser: babelParser,
+    },
+
+    settings: {
+      react: {
+        version: 'detect',
+      },
+    },
+
+    rules: {
+      'no-console': 'off',
+      semi: ['error', 'always'],
+      quotes: ['error', 'single'],
+      'no-duplicate-imports': 'error',
+      'react/jsx-uses-react': 'off',
+      'react/react-in-jsx-scope': 'off',
+      'react-hooks/rules-of-hooks': 'error',
+      'react-hooks/exhaustive-deps': 'warn',
+
+      'react/no-unknown-property': [
+        'error',
+        {
+          ignore: ['watch', 'align'],
+        },
+      ],
+    },
+  },
+  {
+    files: ['src/**/*.jsx'],
+  },
+  ...compat.extends('plugin:mdx/recommended').map((config) => ({
+    ...config,
+    files: ['**/*.mdx'],
+  })),
+  {
+    files: ['**/*.mdx'],
+
+    languageOptions: {
+      globals: {
+        Badge: true,
+        StackBlitzPreview: true,
+      },
+    },
+
+    settings: {
+      'mdx/code-blocks': true,
+    },
+
+    rules: {
+      semi: ['off'],
+    },
+  },
+  {
+    files: ['**/*.mdx/*.{js,javascript}'],
+
+    rules: {
+      indent: ['error', 2],
+
+      quotes: [
+        'error',
+        'single',
+        {
+          allowTemplateLiterals: true,
+        },
+      ],
+
+      'no-undef': 'off',
+      'no-unused-vars': 'off',
+      'no-constant-condition': 'off',
+      'no-useless-escape': 'off',
+      'no-dupe-keys': 'off',
+      'no-duplicate-imports': 'off',
+    },
+  },
+];

package.json

@@ -75,6 +75,9 @@
     "@babel/plugin-proposal-class-properties": "^7.17.12",
     "@babel/preset-env": "^7.24.8",
     "@babel/preset-react": "^7.24.7",
+    "@eslint/compat": "^1.1.1",
+    "@eslint/eslintrc": "^3.1.0",
+    "@eslint/js": "^9.7.0",
     "@mdx-js/loader": "^3.0.1",
     "@mdx-js/react": "^3.0.1",
     "@octokit/auth-action": "^5.1.1",
@@ -90,14 +93,15 @@
     "directory-tree": "^3.5.2",
     "directory-tree-webpack-plugin": "^1.0.3",
     "duplexer": "^0.1.1",
-    "eslint": "^8.57.0",
+    "eslint": "^9.7.0",
     "eslint-config-prettier": "^9.1.0",
     "eslint-plugin-cypress": "^3.3.0",
     "eslint-plugin-mdx": "^3.1.5",
     "eslint-plugin-react": "^7.35.0",
     "eslint-plugin-react-hooks": "^4.6.2",
     "front-matter": "^4.0.2",
     "github-slugger": "^2.0.0",
+    "globals": "^15.8.0",
     "html-webpack-plugin": "^5.5.4",
     "http-server": "^14.1.1",
     "husky": "^9.1.1",

src/utilities/fetch-package-repos.mjs

@@ -79,6 +79,7 @@ async function main() {
         } else {
           console.warn(e.message);
         }
+        // eslint-disable-next-line no-unused-vars
       } catch (e2) {
         throw e;
       }

src/utilities/fetch-supporters.mjs

@@ -113,7 +113,7 @@ const getAllNodes = async (graphqlQuery, getNodes) => {
     remaining = 100;
   }
   // Handling pagination if necessary
-  // eslint-disable-next-line
+   
   while (true) {
     if (remaining === 0) {
       console.log(`Rate limit exceeded. Sleeping until ${new Date(reset)}.`);

src/utilities/process-readme.mjs

@@ -83,7 +83,7 @@ function linkFixerFactory(sourceUrl) {
 function getMatches(string, regex) {
   const matches = [];
   let match;
-  // eslint-disable-next-line
+   
   while ((match = regex.exec(string))) {
     matches.push(match);
   }

src/utilities/test-local-storage.js

@@ -9,6 +9,7 @@ module.exports = function () {
   try {
     localStorage.setItem(test, test);
     localStorage.removeItem(test);
+    // eslint-disable-next-line no-unused-vars
   } catch (e) {
     return false;
   }

webpack.ssg.mjs

@@ -13,8 +13,6 @@ const contentTree = JSON.parse(fs.readFileSync('./src/_content.json', 'utf8'));
 
 // Load Common Configuration
 import common from './webpack.common.mjs';
-import { fileURLToPath } from 'url';
-const __filename = fileURLToPath(import.meta.url);
 
 // content tree to path array
 const paths = [...flattenContentTree(contentTree), '/app-shell'];